To each his own on feeling sad about the death of LFG chat (our community has been through a lot worse things than the death of LFG but we're still strong), and i might be wrong on this but i dont think Warmanes population per server is the same as retail (more ppl per server equaling more chat spam making the need for different chat channels a necessity), but almost every rdf i've ever done people always spam LFG on global before queuing up, its a time saver and i dont like wasting my time whether its 5 mins or 15.
People from opposing factions with way too much time on their hands will begin camping summoning stones and dungeon entrances, and within a few weeks of opening you'll see thread after thread of angry people screaming for the return of the rdf, the time some people have to invest in a game you want to be successful is limited, and they wont want it wasted unnecessarily. Whether or not rdf stays or goes ill still check out Lordaeron, but be prepared for the inexorable **** storm that's going to follow having a nonexistent rdf.